defmodule MicrowavepropWeb.UserResetPasswordController do
  use MicrowavepropWeb, :controller

  alias Microwaveprop.Accounts

  plug :get_user_by_reset_password_token when action in [:edit, :update]

  @spec new(Plug.Conn.t(), map()) :: Plug.Conn.t()
  def new(conn, _params) do
    render(conn, :new)
  end

  @spec create(Plug.Conn.t(), map()) :: Plug.Conn.t()
  def create(conn, %{"user" => %{"email" => email}}) do
    _ =
      if user = Accounts.get_user_by_email(email) do
        {:ok, _email} =
          Accounts.deliver_user_reset_password_instructions(
            user,
            &url(~p"/users/reset-password/#{&1}")
          )
      end

    # Always respond the same way whether or not the email exists — this is
    # a deliberate anti-enumeration measure. If we redirected differently on
    # a miss, an attacker could iterate emails to discover registered accounts.
    conn
    |> put_flash(
      :info,
      "If your email is in our system, you will receive instructions to reset your password shortly."
    )
    |> redirect(to: ~p"/users/log-in")
  end

  @spec edit(Plug.Conn.t(), map()) :: Plug.Conn.t()
  def edit(conn, _params) do
    render(conn, :edit,
      changeset: Accounts.change_user_password(conn.assigns.user),
      token: conn.assigns.token
    )
  end

  @spec update(Plug.Conn.t(), map()) :: Plug.Conn.t()
  def update(conn, %{"user" => user_params}) do
    case Accounts.reset_user_password(conn.assigns.user, user_params) do
      {:ok, _} ->
        conn
        |> put_flash(:info, "Password reset successfully.")
        |> redirect(to: ~p"/users/log-in")

      {:error, changeset} ->
        render(conn, :edit, changeset: changeset, token: conn.assigns.token)
    end
  end

  defp get_user_by_reset_password_token(conn, _opts) do
    %{"token" => token} = conn.params

    if user = Accounts.get_user_by_reset_password_token(token) do
      conn |> assign(:user, user) |> assign(:token, token)
    else
      conn
      |> put_flash(:error, "Reset link is invalid or it has expired.")
      |> redirect(to: ~p"/users/reset-password")
      |> halt()
    end
  end
end